Hey folks, are there differences such as: support for new technologies, SSL or TLS versions, which one is faster and supports more users, things like that…
Jetty 11.0.9 (jServer 4) was released about 3 years after the Jetty 9 version that was wrapped by jServer 3.
There were hundreds of improvements and bug fixes: https://github.com/jetty/jetty.project/releases
A B4J specific improvement is the ability to build a standalone package with jServer 4.